package com.renan.csv;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.Bean;
import org.springframework.scheduling.annotation.EnableAsync;
import org.springframework.scheduling.annotation.EnableScheduling;
import org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor;

import java.util.concurrent.Executor;
import java.util.concurrent.ThreadPoolExecutor;

/**
 * @author 张亚林
 * @date 2020-11-24
 */
@EnableAsync
@EnableScheduling
@SpringBootApplication
public class CsvApplication {
    public static void main(String[] args) {
        SpringApplication.run(CsvApplication.class, args);
    }

    @Bean("taskExecutor")
    public Executor taskExecutor() {
        ThreadPoolTaskExecutor executor = new ThreadPoolTaskExecutor();
        //核心线程数10：线程池创建时候初始化的线程数
        executor.setCorePoolSize(16);
        //最大线程数20：线程池最大的线程数，只有在缓冲队列满了之后才会申请超过核心线程数的线程
        executor.setMaxPoolSize(32);
        //缓冲队列200：用来缓冲执行任务的队列
        executor.setQueueCapacity(1024);
        //允许线程的空闲时间60秒：当超过了核心线程出之外的线程在空闲时间到达之后会被销毁
        executor.setKeepAliveSeconds(120);
        //线程池对拒绝任务的处理策略：这里采用了CallerRunsPolicy策略，
        // 当线程池没有处理能力的时候，该策略会直接在 execute 方法的调用线程中运行被拒绝的任务；
        // 如果执行程序已关闭，则会丢弃该任务
        executor.setThreadNamePrefix("zip<->csv->");
        executor.setRejectedExecutionHandler(new ThreadPoolExecutor.CallerRunsPolicy());
        return executor;
    }
}
